: This is specifically Episode 35 of the 2014 saga.
: Mr. Satan manages to make a breakthrough with Majin Buu after they find and heal an injured puppy. Buu is persuaded to stop his destructive behavior, but this moment of peace is shattered when two "heartless" gunmen appear and shoot the dog. Note on Episode Numbering Dragon Ball Kai 2014 (Dub) Episode 35
If you were looking for the episode where Goku returns to his body during the Frieza Saga, that is , titled "Goku's Comeback! Call Forth Porunga!" . : This is specifically Episode 35 of the 2014 saga